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Bell's inequality is a no-go theorem contrasting crucial correlations of physical observables in QM to those of the world as described by classical mechanics, essentially local hidden variables theories serving as a viable "explanation" of QM: QM inevitably violates these inequalities, as observed. Further use for the CHSH inequality generalization.

5
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The conclusion that the violation of Bell's inequalities imply faster than light communication can only be reached in counterfactual reasoning. In our quantum universe counterfactuals ("would X have b …
answered Oct 30 '14 by Johannes
1
vote
The statement "The observed violations of the Bell inequalities disprove local hidden variable theories" is a profound one, and certainly does not qualify as a didactically over-simplification. In e …
answered Dec 30 '12 by Johannes
20
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Wolfram's early work on cellular automata (CAs) has been useful in some didactical ways. The 1D CAs defined by Wolfram can be seen as minimalistic models for systems with many degrees of freedom and a …
answered Jan 30 '11 by Johannes